Reduce audio sampling rate to avoid overrun

1

On an android-powered box the audio input suffers overrun. The native sampling rate is 44k. How to reduce the sampling rate to 16k? The following constraints appears to have no effect:

 const constraints = {
          audio: {
            sampleRate: 16000,
          },
         ...
}

From code I can see react-native-webrtc does pass the constraints down to webrtc. Is there a way to force the sampling rate lower in webrtc itself?

Thanks!